scholarly journals PHOTOELECTRIC APPARATUS FOR MEASURING LEAF AREAS

1935 ◽  
Vol 10 (3) ◽  
pp. 569-574 ◽  
Author(s):  
Donald E. H. Frear
Keyword(s):  
Photoelectric Apparatus

RBC Aggregometer head as a Warning Monitor of Flow Disturbance in Extracorporeal Systems

1987 ◽  
Vol 10 (5) ◽  
pp. 295-300 ◽  
Author(s):  
M. Tomita ◽  
N. Tanahashi
Keyword(s):  
Renal Failure ◽  
Whole Blood ◽  
Clinical Case ◽  
Light Transmission ◽  
Alarm System ◽  
Flow Disturbance ◽  
Voltage Comparator ◽  
Rbc Aggregation ◽  
Photoelectric Apparatus ◽  
Excellent Stability

A simple photoelectric apparatus is described, to monitor the flow condition of whole blood in an extracorporeal system. It can raise an immediate alarm on disturbance of flow. The apparatus comprises an RBC aggregometer head, described previously, for measuring the rate of RBC aggregation in whole blood. Its construction was modified for easy attach-ability and detachability without causing tube damage. In practice, the apparatus was applied by hooking it to the tube of the extracorporeal system in animals and in a clinical case of blood dialysis in a patient with renal failure, in which stoppage of blood flow elicited a dramatic change in the baseline record of light transmission of the mobile blood. The signal of the apparatus was fed to an alarm system via a voltage comparator switch. The apparatus is inexpensive, solid and durable, easy to operate by untrained personnel, and has excellent stability and reproducibility.

scholarly journals Platelet Determination by Turbidimetry

Blood ◽  
1954 ◽  
Vol 9 (9) ◽  
pp. 920-926 ◽  
Author(s):  
W. O. CRUZ
Keyword(s):  
Standard Deviation ◽  
Light Absorption ◽  
Statistical Tests ◽  
Platelet Volume ◽  
Platelet Suspension ◽  
Surgical Interventions ◽  
Special Apparatus ◽  
Photoelectric Apparatus ◽  
Male Patients ◽  
Blood Elements

Abstract A method to determine the amount of circulating platelets without the aid of any special apparatus is described. The method consists in separating the platelets from the other blood elements by fractional centrifugation and in measuring the light absorption of the platelet suspension in a photoelectric apparatus. Light absorption is standardized against the platelet volume found by the Van Allen thrombocytocrit, and results presented as platelet volume in 100 ml. of bood. The error of the method was found to be 6 per cent. To test the consistency of the method, normal dogs and patients of both sexes with different pathologic conditions were studied, the results agreeing with the data found in the literature. In dogs of both sexes, twenty males showed 0.50 ml. per 100 ml. blood with a standard deviation of ±0.15, and ten females 0.53 ml./100 ml. ±0.17; fiftytwo male patients showed 0.45 ml. per 100 ml. of blood with a standard deviation of ±0.20, and thirty-one females 0.44 ml./100 ml. ±0.23. Still further to test the reliability of the method, a confirmation was undertaken of the fact of platelet increase in the postoperative period in major surgical interventions. Twenty-seven patients with 0.38 ml./100 ml. (±0.16 as standard deviation) platelets showed soon after the operation 0.44 ml./100 ml. ±0.19 a difference not significant according to statistical tests; eleven days after the operation, average platelets were 0.60 ± 0.21 ml./100 ml. a highly significant increase.

A novel analysis of spun yarn hairiness inside limited two-dimensional space

2019 ◽  
Vol 89 (21-22) ◽  
pp. 4710-4716 ◽  
Author(s):  
Zhigang Xia ◽  
Xin Liu ◽  
KeZuo Wang ◽  
Bo Deng ◽  
Weilin Xu
Keyword(s):  
Dimensional Space ◽  
Test Methods ◽  
Test Apparatus ◽  
Air Inlet ◽  
Spun Yarn ◽  
Spun Yarns ◽  
Photoelectric Apparatus ◽  
Subsequent Measurement ◽  
Yarn Hairiness ◽  
Improved Accuracy

Surface hairiness of spun yarns is critical to the yarn post-processing deficiency and resultant fabric quality. Several test methods are available for measuring yarn hairiness but they cannot detect the accurate hair amount and precise hair length. This paper provides a novel method to perform accurate hairiness tests on the spun yarn. A new test apparatus was devised by installing a blowing pipe outside of the hairiness testing area comprising a projection receiver and a corresponding laser. The rectangle end plane of the blowing pipe air inlet is vertical to the laser plane and tangent to the edge line of the projection receiver surface. Pressure generated through this inlet stretches yarn wild hairiness straightly in one direction, and fully maps accurate hairiness amount and length configuration on the projection receiver surface. The subsequent measurement showed that this novel test apparatus detected more hairiness with improved accuracy in both number and length of hairiness. Approximately real gravimetric hairiness weight can be obtained by this method which is impracticable for other conventional photoelectric apparatus.

A Portable Apparatus for Colloidal Gold Test on Clenbuterol

2012 ◽  
Vol 490-495 ◽  
pp. 3100-3104
Author(s):  
Zi Jian Yang ◽  
Tai Hu Wu ◽  
Feng Chen
Keyword(s):  
Quantitative Analysis ◽  
Food Safety ◽  
Colloidal Gold ◽  
Design Method ◽  
Integrated Approach ◽  
Linear Ccd ◽  
Green Led ◽  
Portable Apparatus ◽  
Photoelectric Apparatus ◽  
Site Test

To quantitatively detect the on-site test of the content of clenbuterol in pork, a photoelectric apparatus for the colloidal gold test to detect clenbuterol was developed based on green LED and linear CCD. This design method could realize a semi-quantitative analysis of clenbuterol concentrations ranging from 0 to 1 ng/ml. Such an apparatus could promote an integrated approach to the management of the community food safety

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